Hey Gang- updated to F13 from stable, working F12 system which had 256.xx driver. Using official nvidia drivers (as Livna route has not worked for me in the past and only complicated things). startx stops right after line Loading extension NV-GLX with the following 'NVIDIA(0): WAIT: (E, 0, 0x857d,0)' according to xorg.log.

I am using the extra grub.conf entry to blacklist nouveau, i.e. rdblacklist='nouveau nomodeset'